Hide “children-posts” from parent.

Hi there..

I’m looking for a way of hiding all the posts from children categories.
Lets say that i have it like this:

SiteNews
1. New Plugins
2. New Themes

Today, as i click “SiteNews”, my children-posts show up wich results in that i get all the posts from “SiteNews”, “New Plugins” and “New Posts” on that page.

If it’s not obvious, i’d only like my posts from “SiteNews” to show up there without getting the subcategories of (any)parents..

Thanks for any help..
cordac